Battery charger



FIG. 1 is a front perspective view of an embodiment of a battery charger showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG 5 is a left side elevational view thereof;

FIG. 6 is a top view thereof;

FIG 7 is a bottom view thereof; and

FIG. 8 is a front perspective view thereof with an inserted battery. The broken line showing of the battery is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a battery charger, as shown and described. 